Abstract

We report a miniaturized inline Fabry–Perot interferometer directly fabricated on a single-mode optical fiber with a femtosecond laser. The device had a loss of 16dB and an interference visibility exceeding 14dB. The device was tested and survived in high temperatures up to 1100°C. With an accessible cavity and all-glass structure, the new device is attractive for sensing applications in high-temperature harsh environments.

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